답안 #197912

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
197912	2020-01-24T07:25:15 Z	TAISA_	가로등 (APIO19_street_lamps)	C++14	100 / 100	2948 ms	269288 KB

street_lamps

#include <bits/stdc++.h>
#define mp make_pair
#define all(v) v.begin(),v.end()
using namespace std;
using ll=long long;
using vi=vector<ll>;
using P=pair<int,int>;
struct BIT{
	vector<int> dat;
	void build(int n){
		dat.resize(n+1,0);
	}
	void add(int k,int x){
		for(++k;k<dat.size();k+=k&-k){
			dat[k]+=x;
		}
	}
	int get(int k){
		int res=0;
		for(++k;k>0;k-=k&-k){
			res+=dat[k];
		}
		return res;
	}
};
struct Segtree{
	int n;
	vector<BIT> dat;
	vector<vector<int>> ds,ls,rs;
	Segtree(int n_){
		n=1;
		while(n<n_)n<<=1;
		ds.resize(2*n);
		ls.resize(2*n);
		rs.resize(2*n);
		dat.resize(2*n);
	}
	void preupd(int x,int y){
		ds[x+n].push_back(y);
	}
	void build(){
		for(int k=2*n-1;k>=n;k--){
			sort(all(ds[k]));
			ds[k].erase(unique(all(ds[k])),ds[k].end());
		}
		for(int k=n-1;k>0;k--){
			ds[k].resize(ds[k<<1].size()+ds[k<<1|1].size());
			merge(all(ds[k<<1]),all(ds[k<<1|1]),ds[k].begin());
			ds[k].erase(unique(all(ds[k])),ds[k].end());
			ls[k].resize(ds[k].size()+1);
			rs[k].resize(ds[k].size()+1);
			int t1=0,t2=0;
			for(int i=0;i<ds[k].size();i++){
				while(t1<ds[k<<1].size()&&ds[k<<1][t1]<ds[k][i])++t1;
				while(t2<ds[k<<1|1].size()&&ds[k<<1|1][t2]<ds[k][i])++t2;
				ls[k][i]=t1;
				rs[k][i]=t2;
			}
			ls[k][ds[k].size()]=ds[k<<1].size();
			rs[k][ds[k].size()]=ds[k<<1|1].size();
		}
		for(int k=0;k<2*n-1;k++){
			dat[k].build(ds[k].size());
		}
	}
	void upd(int x,int y,int z){
		int k=x+n;
		int yy=lower_bound(all(ds[k]),y)-ds[k].begin();
		dat[k].add(yy,z);
		k>>=1;
		while(k>0){
			yy=lower_bound(all(ds[k]),y)-ds[k].begin();
			dat[k].add(yy,z);
			k>>=1;
		}
	}
	int get(int a,int b,int x,int y,int k,int l,int r){
		if(b<=l||r<=a){
			return 0;
		}
		if(a<=l&&r<=b){
			return dat[k].get(y-1)-dat[k].get(x-1);
		}
		return get(a,b,ls[k][x],ls[k][y],k<<1,l,(l+r)>>1)+
				get(a,b,rs[k][x],rs[k][y],k<<1|1,(l+r)>>1,r);
	}
	inline int get(int a,int b,int x,int y){
		x=lower_bound(all(ds[1]),x)-ds[1].begin();
		y=lower_bound(all(ds[1]),y)-ds[1].begin();
		return get(a,b,x,y,1,0,n);
	}
};
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n,q;cin>>n>>q;
	string str;cin>>str;
	int b=-1;
	Segtree seg(n+10);
	set<pair<P,int>> st;
	vector<P> vi;
	for(int i=0;i<n;i++){
		if(str[i]=='1'){
			if(b==-1){
				b=i;
			}
		}else{
			if(b!=-1){
				st.insert(mp(P(b,i-1),-1));
				seg.preupd(b,i-1);
				b=-1;
			}
		}
	}
	if(b!=-1){
		st.insert(mp(P(b,n-1),-1));
		seg.preupd(b,n-1);
	}
	vector<vector<pair<P,int>>> vs(q);
	vector<int> res(q),aa(q,-1),bb(q);
	for(int i=0;i<q;i++){
		string t;cin>>t;
		if(t=="toggle"){
			int a;cin>>a;--a;
			auto add=[&](pair<P,int> p){
				st.erase(p);
				seg.preupd(p.first.first,p.first.second);
				vs[i].emplace_back(p.first,p.second);
			};
			auto ins=[&](pair<P,int> p){
				if(p.first.first<=p.first.second){
					st.insert(p);
				}
			};
			if(str[a]=='0'){
				str[a]='1';
				pair<P,int> to=mp(P(a,a),i);
				if(st.empty()){
					ins(to);
					continue;
				}
				auto ir=st.lower_bound(to);
				if(ir!=st.end()&&(*ir).first.first==a+1){
					to.first.second=(*ir).first.second;
					add(*ir);
				}
				auto il=st.lower_bound(to);
				if(il!=st.begin()){
					--il;
					if((*il).first.second==a-1){
						to.first.first=(*il).first.first;
						add(*il);
					}
				}
				ins(to);
			}else{
				str[a]='0';
				auto it=prev(st.lower_bound(mp(P(a+1,-1),-1)));
				pair<P,int> p=(*it);
				add(*it);
				ins(mp(P(p.first.first,a-1),i));
				ins(mp(P(a+1,p.first.second),i));
			}
		}else{
			int a;cin>>a>>b;--a;--b;--b;
			aa[i]=a,bb[i]=b;
			seg.preupd(0,a+1);
			seg.preupd(b,n);
			auto it=st.lower_bound(mp(P(a+1,-1),-1));
			if(!st.empty()&&it!=st.begin()){
				--it;
				if((*it).first.first<=a&&b<=(*it).first.second){
					res[i]+=i-(*it).second;
				}
			}
		}	
	}
	seg.build();
	for(int i=0;i<q;i++){
		if(aa[i]==-1){
			for(auto &e:vs[i]){
		//		cout<<e.first.first<<" "<<e.first.second<<" "<<i-e.second<<endl;
				seg.upd(e.first.first,e.first.second,i-e.second);
			}
		}else{
			res[i]+=seg.get(0,aa[i]+1,bb[i],n);
			//cout<<0<<" "<<aa[i]<<" "<<bb[i]<<" "<<n-1<<" "<<seg.get(0,aa[i]+1,bb[i],n)<<endl;
			cout<<res[i]<<'\n';
		}
	}	
}

Compilation message

street_lamps.cpp: In member function 'void BIT::add(int, int)':
street_lamps.cpp:14:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(++k;k<dat.size();k+=k&-k){
           ~^~~~~~~~~~~
street_lamps.cpp: In member function 'void Segtree::build()':
street_lamps.cpp:53:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<ds[k].size();i++){
                ~^~~~~~~~~~~~~
street_lamps.cpp:54:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(t1<ds[k<<1].size()&&ds[k<<1][t1]<ds[k][i])++t1;
           ~~^~~~~~~~~~~~~~~~
street_lamps.cpp:55:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(t2<ds[k<<1|1].size()&&ds[k<<1|1][t2]<ds[k][i])++t2;
           ~~^~~~~~~~~~~~~~~~~~

Subtask #1

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	504 KB	Output is correct
3	Correct	2 ms	376 KB	Output is correct
4	Correct	2 ms	376 KB	Output is correct
5	Correct	2 ms	380 KB	Output is correct
6	Correct	7 ms	376 KB	Output is correct
7	Correct	2 ms	376 KB	Output is correct

Subtask #2

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	269 ms	21452 KB	Output is correct
2	Correct	326 ms	22040 KB	Output is correct
3	Correct	623 ms	27628 KB	Output is correct
4	Correct	2682 ms	265968 KB	Output is correct
5	Correct	2805 ms	267124 KB	Output is correct
6	Correct	2836 ms	263424 KB	Output is correct
7	Correct	1273 ms	255168 KB	Output is correct
8	Correct	1255 ms	256620 KB	Output is correct

Subtask #3

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	760 KB	Output is correct
2	Correct	5 ms	888 KB	Output is correct
3	Correct	5 ms	888 KB	Output is correct
4	Correct	1 ms	888 KB	Output is correct
5	Correct	2666 ms	240628 KB	Output is correct
6	Correct	2887 ms	259676 KB	Output is correct
7	Correct	2655 ms	262532 KB	Output is correct
8	Correct	1357 ms	249228 KB	Output is correct
9	Correct	140 ms	14860 KB	Output is correct
10	Correct	151 ms	16508 KB	Output is correct
11	Correct	155 ms	16364 KB	Output is correct
12	Correct	1208 ms	247604 KB	Output is correct
13	Correct	1210 ms	249392 KB	Output is correct

Subtask #4

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	888 KB	Output is correct
2	Correct	7 ms	888 KB	Output is correct
3	Correct	4 ms	888 KB	Output is correct
4	Correct	3 ms	888 KB	Output is correct
5	Correct	1867 ms	269288 KB	Output is correct
6	Correct	2130 ms	265752 KB	Output is correct
7	Correct	2451 ms	260768 KB	Output is correct
8	Correct	2948 ms	245192 KB	Output is correct
9	Correct	353 ms	22912 KB	Output is correct
10	Correct	270 ms	23672 KB	Output is correct
11	Correct	348 ms	22840 KB	Output is correct
12	Correct	272 ms	23672 KB	Output is correct
13	Correct	348 ms	22772 KB	Output is correct
14	Correct	278 ms	23672 KB	Output is correct
15	Correct	1230 ms	247752 KB	Output is correct
16	Correct	1224 ms	249216 KB	Output is correct

Subtask #5

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	2 ms	504 KB	Output is correct
3	Correct	2 ms	376 KB	Output is correct
4	Correct	2 ms	376 KB	Output is correct
5	Correct	2 ms	380 KB	Output is correct
6	Correct	7 ms	376 KB	Output is correct
7	Correct	2 ms	376 KB	Output is correct
8	Correct	269 ms	21452 KB	Output is correct
9	Correct	326 ms	22040 KB	Output is correct
10	Correct	623 ms	27628 KB	Output is correct
11	Correct	2682 ms	265968 KB	Output is correct
12	Correct	2805 ms	267124 KB	Output is correct
13	Correct	2836 ms	263424 KB	Output is correct
14	Correct	1273 ms	255168 KB	Output is correct
15	Correct	1255 ms	256620 KB	Output is correct
16	Correct	4 ms	760 KB	Output is correct
17	Correct	5 ms	888 KB	Output is correct
18	Correct	5 ms	888 KB	Output is correct
19	Correct	1 ms	888 KB	Output is correct
20	Correct	2666 ms	240628 KB	Output is correct
21	Correct	2887 ms	259676 KB	Output is correct
22	Correct	2655 ms	262532 KB	Output is correct
23	Correct	1357 ms	249228 KB	Output is correct
24	Correct	140 ms	14860 KB	Output is correct
25	Correct	151 ms	16508 KB	Output is correct
26	Correct	155 ms	16364 KB	Output is correct
27	Correct	1208 ms	247604 KB	Output is correct
28	Correct	1210 ms	249392 KB	Output is correct
29	Correct	4 ms	888 KB	Output is correct
30	Correct	7 ms	888 KB	Output is correct
31	Correct	4 ms	888 KB	Output is correct
32	Correct	3 ms	888 KB	Output is correct
33	Correct	1867 ms	269288 KB	Output is correct
34	Correct	2130 ms	265752 KB	Output is correct
35	Correct	2451 ms	260768 KB	Output is correct
36	Correct	2948 ms	245192 KB	Output is correct
37	Correct	353 ms	22912 KB	Output is correct
38	Correct	270 ms	23672 KB	Output is correct
39	Correct	348 ms	22840 KB	Output is correct
40	Correct	272 ms	23672 KB	Output is correct
41	Correct	348 ms	22772 KB	Output is correct
42	Correct	278 ms	23672 KB	Output is correct
43	Correct	1230 ms	247752 KB	Output is correct
44	Correct	1224 ms	249216 KB	Output is correct
45	Correct	124 ms	13624 KB	Output is correct
46	Correct	174 ms	14064 KB	Output is correct
47	Correct	1161 ms	88216 KB	Output is correct
48	Correct	2595 ms	263016 KB	Output is correct
49	Correct	170 ms	17896 KB	Output is correct
50	Correct	162 ms	17980 KB	Output is correct
51	Correct	174 ms	18088 KB	Output is correct
52	Correct	185 ms	18664 KB	Output is correct
53	Correct	170 ms	18664 KB	Output is correct
54	Correct	194 ms	18664 KB	Output is correct